The objectives of this study are to test the Diaphragm Pacing Stimulation (DPS) System for treating chronic ventilatory insufficiency in persons with respiratory muscle paralysis. The hypothesis being tested in the clinical trial is that laparoscopic stimulation of the diaphragm at the motor point with intramuscular electrodes is safe and effective in providing significant ventilatory support to individuals who are otherwise dependant on a mechanical ventilator. Patients in our initial study group have all suffered from high-level spinal cord injury and were full-time dependant on positive pressure mechanical ventilation prior to inclusion.